Answer :

Final answer:

To calculate the volume of cephalexin to administer, convert the order to the same units as the reconstitution ratio. The medication concentration is 250 mg per 5 mL. The nurse should administer 7.5 mL of cephalexin.

Explanation:

The student's question involves reconstituting a medication in order to administer the correct dosage. Specifically, the question asks: If an order is for 375mg of cephalexin PO and the reconstitution gives 0.25g/5mL, how many mL should the nurse administer?

To find the answer, we need to convert the prescribed medication dose to the same units as the reconstitution ratio, and then use this information to calculate the volume to be administered. Since we know that 1 gram is equal to 1000 milligrams, we can convert 0.25 grams to milligrams:

  • 0.25 g = 250 mg

Now, we can set up a proportion with the information given, mindful that the medication concentration is 250 mg per 5 mL:

  • 250 mg : 5 mL = 375 mg : x mL

We'll solve for x, which represents the volume (in mL) to be administered:

  • x = (375 mg * 5 mL) / 250 mg
  • x = 7.5 mL

Thus, the nurse should administer 7.5 mL of the reconstituted cephalexin.

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